There are many train services for the coming months from as low as £1 + 50p booking fee with megatrain. They sell on behalf of Virgin Trains, East Midlands and South West Trains. When you book, you print off a booking sheet and show to the conductor on the train when travelling (you do not have a regular ticket). Some services will have carriages dedicated to Megatrain customers. Example prices are : £1 from London to Birmingham (Virgin Trains) and £5 Birmingham to Edinburgh (Virgin Trains).

In order to get the best fares, book far in advance and for services mid-week!